Difficult HVAC PE Practice Problem

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SUMMARY

The discussion centers on determining the wet bulb temperature (Twb) of air entering a room, given the dry-bulb temperature. The problem is identified as a challenging HVAC PE practice problem, specifically a psychometric mixing and cooling calculation. Participants are encouraged to share their approaches and solutions, emphasizing the importance of understanding psychrometric principles in HVAC applications.

PREREQUISITES
  • Understanding of psychrometric principles
  • Familiarity with HVAC systems and components
  • Knowledge of dry-bulb and wet-bulb temperature concepts
  • Experience with psychrometric charts and calculations
NEXT STEPS
  • Study psychrometric mixing calculations in detail
  • Learn how to use psychrometric charts effectively
  • Explore HVAC system design principles related to temperature control
  • Review common HVAC PE exam practice problems for better preparation
USEFUL FOR

HVAC engineers, students preparing for the PE exam, and professionals seeking to enhance their understanding of psychrometric calculations in HVAC design.

Remusco
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Misplaced Homework Thread with no effort shown
TL;DR Summary: Determine the wet bulb temperature of air entering a room when the dry-bulb temperature is given.

This is the hardest HVAC PE practice problem I've attempted. Can someone show me how they would approach this?
The goal is to find Twb leaving the cooling coil as shown in the image below:

1735951730918.png
 
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I've moved this to homework help because it is a homework type problem.

At first glance this looks like a straightforward psychometric mixing and cooling problem, unless there is a trick that reveals itself after solving the basic problem. Please show us your attempted solution.....you can do a psychrometric mixing calculation, right?
 
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